/* Overview / Research only. The existing Hero and later chapter frames stay intact. */
.project-story { color: var(--color-body); }
.project-story h3, .project-story h4 { margin: 0; color: var(--ink); font-weight: var(--project-weight-heading); line-height: var(--leading-heading); letter-spacing: var(--tracking-heading); }
.project-story h3 { font-size: var(--project-type-module); }
.project-story h4 { font-size: var(--project-type-module); }
.project-story p { margin: 0; font-size: var(--project-type-body); line-height: var(--project-leading-body); letter-spacing: var(--tracking-body); }
.project-story .research-note { color: var(--muted); font-size: var(--project-type-small); line-height: var(--leading-small); }
.story-intro { display: block; }
.story-intro__copy { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-24); align-items: start; }
.story-intro__copy > p:not(.story-lead) { grid-column: 2 / -1; max-width: 74ch; }
.project-story .story-lead { color: var(--ink); font-size: var(--project-type-emphasis); font-weight: var(--project-weight-heading); line-height: var(--leading-heading); }
.overview-principles { list-style: none; margin: var(--space-24) 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-24); }
.overview-principles li { border-top: var(--border-subtle); padding-top: var(--space-12); }
.overview-principles p { margin-top: var(--space-12); }
.research-heading { display: grid; gap: var(--project-paragraph-gap); max-width: var(--project-reading-width); }
.research-module { margin-top: var(--space-48); }
.research-module__title { display: flex; align-items: baseline; gap: var(--space-12); margin-bottom: var(--space-16); }
.research-module__title > span { color: var(--color-accent); font-size: var(--project-type-small); letter-spacing: .08em; }
.research-context { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: var(--space-32); align-items: center; }
.research-context__copy { display: grid; gap: var(--project-paragraph-gap); max-width: var(--project-reading-width); }
.research-figure { margin: 0; min-width: 0; }
.research-figure img { display: block; width: 100%; height: auto; }
.research-figure figcaption { margin-top: var(--space-12); color: var(--muted); font-size: var(--project-type-small); line-height: var(--leading-small); }
.research-flow { margin: var(--space-24) 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); list-style: none; border-block: var(--border-subtle); }
.research-flow li { position: relative; padding: var(--space-16) var(--space-24); border-left: var(--border-subtle); }
.research-flow li:first-child { padding-left: 0; border-left: 0; }
.research-flow li:last-child { padding-right: 0; }
.research-flow li + li::before { content: '→'; position: absolute; left: -8px; top: 16px; background: var(--paper); color: var(--muted); }
.research-flow p { margin-top: var(--space-12); }
.research-module__intro { margin-bottom: var(--space-16) !important; max-width: var(--project-reading-width); }
.research-models { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-16); margin: 0; }
.research-model { margin: 0; min-width: 0; }
.research-model img { width: 100%; height: auto; display: block; }
.research-model figcaption { margin-top: var(--space-12); font-size: var(--project-type-module); font-weight: var(--project-weight-heading); line-height: var(--leading-heading); color: var(--ink); }
.research-models + .research-note { margin-top: var(--space-16); }
.research-table-hint { display: none; }
.research-table-wrap { overflow-x: auto; overscroll-behavior-x: contain; margin-block: var(--space-32) var(--space-16); }
.research-table-wrap:focus-visible { outline-offset: 4px; }
.research-table { border-collapse: collapse; width: 100%; text-align: left; font-size: var(--project-type-body); line-height: var(--project-leading-body); }
.research-table caption { text-align: left; margin-bottom: var(--space-16); color: var(--ink); font-size: var(--project-type-module); font-weight: var(--project-weight-heading); line-height: var(--leading-heading); }
.research-table th, .research-table td { border-bottom: var(--border-subtle); padding: var(--space-16); vertical-align: top; }
.research-table thead th { padding-top: var(--space-16); color: var(--muted); font-size: var(--project-type-small); font-weight: var(--weight-regular); border-top: var(--border-subtle); }
.research-table th:first-child, .research-table td:first-child { padding-left: 0; }
.research-table th:last-child, .research-table td:last-child { padding-right: 0; }
.research-table tbody th { min-width: 80px; color: var(--ink); font-weight: var(--project-weight-heading); }
.research-table td:nth-child(2), .research-table td:nth-child(3) { white-space: nowrap; font-variant-numeric: tabular-nums; }
.research-table td:nth-child(4) { width: 34%; }
.research-table td:last-child { width: 28%; }
.research-table .research-missing { white-space: normal; font-size: var(--project-type-small); color: var(--muted); }
.research-considerations { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-24); margin-top: var(--space-24); }
.research-considerations > div { border-top: var(--border-subtle); padding-top: var(--space-16); }
.research-considerations p { margin-top: var(--space-12); }
.research-users-head, .research-user { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr) minmax(0, 1.25fr); gap: var(--space-32); }
.research-users-head { padding-bottom: var(--space-16); }
.research-users-head span { font-size: var(--project-type-small); color: var(--muted); }
.research-user { padding-block: var(--space-16); border-top: var(--border-subtle); }
.research-user__label { display: none; }
.project-story .research-question { max-width: 44ch; margin-block: var(--space-32) var(--space-16); font-size: var(--project-type-emphasis); font-weight: var(--project-weight-heading); color: var(--ink); line-height: var(--leading-heading); }
/* Content is visible by default; JS opts in only when an observer is available. */
.research-reveals [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease-feedback), transform .6s var(--ease-feedback); transition-delay: var(--reveal-delay, 0ms); }
.research-reveals [data-reveal][data-revealed], .research-reveals [data-reveal]:focus-within { opacity: 1; transform: none; }
@media (max-width: 1024px) {
  .research-table { min-width: 800px; }
  .research-table-hint { display: block; margin-top: var(--space-24); }
  .research-table-wrap { margin-top: var(--space-16); }
  .research-table-wrap { scrollbar-color: var(--color-rail) var(--color-rail-track); scrollbar-width: thin; }
}
@media (max-width: 760px) {
  .story-intro__copy, .research-context { grid-template-columns: minmax(0, 1fr); }
  .story-intro__copy { gap: var(--project-paragraph-gap); }
  .story-intro__copy > p:not(.story-lead) { grid-column: auto; }
  .overview-principles, .research-considerations { grid-template-columns: minmax(0, 1fr); gap: var(--space-24); }
  .research-module { margin-top: var(--space-48); }
  .research-models { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-24) var(--space-12); }
  .research-flow { grid-template-columns: minmax(0, 1fr); }
  .research-flow li, .research-flow li:first-child, .research-flow li:last-child { padding: var(--space-16) 0; border-left: 0; }
  .research-flow li + li { border-top: var(--border-subtle); }
  .research-flow li + li::before { content: none; }
  .research-users-head { display: none; }
  .research-user { grid-template-columns: minmax(0, 1fr); gap: var(--space-16); }
  .research-user__label { display: block; margin-bottom: var(--space-8); color: var(--muted); font-size: var(--project-type-small); }
}
@media (prefers-reduced-motion: reduce) {
  .research-reveals [data-reveal] { opacity: 1; transform: none; transition: none; }
}